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Protocaseyite, [Al 4 (OH) 6 (H 2 O) 12 ][V 10 O 28 ]·8H 2 O, is a new mineral (IMA2020-090) occurring in low-temperature, post-mining, secondary mineral assemblages at the Burro mine, Slick Rock district, San Miguel County, Colorado, U.S.A. Crystals of protocaseyite are safron-yellow, thick blades, with pale orange-yellow streak, vitreous luster, brittle tenacity, curved fracture, two very good cleavages, a Mohs hardness of 2, and a density of 2.45(2) g/cm 3 . The optical properties of protocaseyite could be only partly determined: biaxial with α = 1.755(5), β &lt; 1.80, γ &gt; 1.80 (white light); pleochroic with  X  and  Y  yellow,  Z  orange ( X  ≈  Y  &lt;  Z ). Electron-probe microanalysis and crystal-structure solution and refinement provided the empirical formula [(Al 3.89 Mg 0.11 Ca 0.02 ) Σ4.02 (OH) 6 (H 2 O) 12 ][H 0.06 V 10 O 28 ]·8H 2 O. Protocaseyite is triclinic,  P 1,  a  = 9.435(2),  b  = 10.742(3),  c  = 11.205(3) Å, α = 75.395(7), β = 71.057(10), γ = 81.286(6)°,  V  = 1036.4(5) Å 3 , and  Z  = 1. The crystal structure ( R  1  = 0.026 for 4032  I  o   &gt; 2 σ I  reflections) contains both the [V 10 O 28 ] 6−  decavanadate polyoxoanion and a novel [Al 4 (OH) 6 (H 2 O) 12 ] 6+  polyoxocation.

Protocaseyite, a new decavanadate mineral containing a [Al 4 (OH) 6 (H 2 O) 12 ] 6+ linear tetramer, a novel isopolycation